Form for precasting interrelated concrete units



' 6 BY hama Sept. 15, 1942. s. A. ROSENBERGER 2,296,187

FORM FOR BBB-CASTING iNTERRELATED CONCRETE nun-s Filed Aug. 4, 1940ATTORNEY.

Patented Sept. 15, 1942 FICE FORM FOR PRECASTING INTERRELATED CONCRETEUNITS Smith Alonzo Rosenberger, Valparaiso, Ind. Application August 4,1940, Serial No. 351,364

2 Claims.

My invention relates to improvements in forms for pre-castinginterrelated concrete or cement units. And it more especially comprisesthe features pointed out in the annexed claims.

The purpose of my invention is to provide interchangeable forms in whichthe cement or concrete units may be produced; that enables me, with onemaster form and exchangeable blocks to produce interchangeable units forsubsequent assembling in any desired manner; and which by'reason of theeconomies affected in the use of my expedients I am able to produceprefabricated units that may be stored for future use.

With these and other ends in view I illustrate in the accompanyingdrawing such instances of adaptation as will disclose the broadinvention without limiting myself to the specific details shown thereonand described herein.

Fig. 1 is a plan view of assembled units produced by my form.

Fig. 2 is an end elevation of the form.

Fig. 3 is a side elevation partly in section showing end blocks or bulkheads to produce the undercut portion of one of the units.

Fig. 4 is a side elevation partly in section showing the bulk headsreversed end for end to produce the other unit.

Fig. 5 is a detached side elevation showing the use made of a separatewedge block to produce square ends of a unit.

Fig. 6 is a semi-perspective of one of the end blocks or bulk heads.

In practicing my invention I may use whatever equivalences andadaptations of structure that the exigencies of varying conditions maydemand without departing from the broad features of the invention.

I use a trough-like form that has an open ended bottom 4 and integralsides 5. The form as'a whole is identified by the numeral 3. In order toproduce the units l and 2 I employ the expedients shown in Figures 3 and4. In each of these cases the bulk heads 6 are used. In Fig. 3 theyproduce the under-cut portions 9 of the unit I by means of the wedgepart 9 and in the case of Fig. 4 they produce the beveled ends 8 of theunit 2 by the inclined end 8. The bulk heads 6 are specially shown inFig. 6 wherein the beveled ends 8 produce the beveled ends 8 of the unit2 and the wedged portion 9 produces the beveled portion 9 of unit I.

The bulk heads 6 may be made solid of aluminum or other material, orthey may be formed out of sheet metal in which case they will be hollowin the center. If formed solidly of aluminum, Wood, or other materialthe portion 9 may be secured tothe larger portion having the beveled end8, by a plate l0 that will hold the part 9 in place against loss. By theuse of my bulk heads I am able to form any combination of units I and 2which may be employed as risers and stringers of steps or for any otherpurpose. The use of the beveled recesses 9' registering with thecorrespondingly beveled ends 8' interlock the units 2 with the units Iagainst displacement. The units l and 2 may be made of any desiredlength. If a bulk head 6 is formed of sheet metal, the approximateoutline shown would be followed by bending the sheet where the changesin angle occur. At the beginning and the ending of the sheet, where theymeet, they may be electrically or otherwise Welded. Should, as statedabove, a sheet metal bulk head be used the center would remain open,because the sides 5 of the form Will cover the open space and thusprevent cement flowing into it.

Heretofore it has been the custom to produce a separate and distinctiveform for each change in shape of a unit. In my case I use a single formwith the removable and reversible bulk heads which prevents amultiplicity of forms.

In Figures Sand 4 the side walls 5 of the form 3 are broken away at theends showing the units l and 2 and also projecting at the center.

I do not limit myself to the specific shape of the bulk heads 6 becausethese may be varied to suit other cases Without departing from the boardspirit of the invention. It is important that a single form withinterchangeable and reversible blocks or bulk heads is used.

Any desired form of pins may be used to position the bulk heads in theform at predetermined distances apart and to hold them in place as thecement fills the space between them. The open face of the trough leavesthe top edge of a unit exposed for extra troweling.

.If the wedge-shaped projection 9 should be used separately, then thebulk head 6 would be formed with one sloping end and a straight portionat the other end still making the bulk head reversible.

In case it is desired to use the bulk head 6 with its attachedprojection 9 in order to form square ended cement units 1 a wedge blockIl may be placed on the sloping end 8 as shown in Fig. 5.

What I claim is:

1. A reversable bulk head for use in producing articles of the classdescribed which comprises a single length of sheet metal formed intoparallel sides, a sloping end, a perpendicular end and a wedge shapedextension extending from the perpendicular end, and a sheet metal platejoining thedifferently formed ends.

2. A reversable bulkhead for use in producing articles of the classdescribed which comprises a member formed with parallel sides, a slopingend, a perpendicular end, a separate member of wedge shaped contourassembled adjacent the first named member with its narrowest portionapproximately abutting the perpendicular end of the first named member,and means for joining the two members with their flat faces on the sameplane to constitute a sinle structure,

SMITH ALONZO ROSENBERGER.

